package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import com.github.pagehelper.Page;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpi implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     * @param dto
     */
    @Transactional //0、开启事务（涉及到多张表的增删改查操作需要开事务）
    public void addDish(DishDTO dto) {
        //1、构造菜品基本信息数据，将其存入dish表中
        Dish dish = new Dish();
        //拷贝属性值
        BeanUtils.copyProperties(dto,dish);
        //调用mapper保存方法
        dishMapper.insert(dish);
        //2、构造菜品口味列表数据，将其存入dish_flavor表中
        List<DishFlavor> dishFlavorList = dto.getFlavors();
        //2.1 关联菜品id
        dishFlavorList.forEach(dishFlavor -> {
            dishFlavor.setDishId(dish.getId());
        });
        //2.2 调用mapper保存方法，批量插入口味列表数据
        dishFlavorMapper.insertBatch(dishFlavorList);
    }

    /**
     * 分页查询菜品列表
     * @param dto
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dto) {
        //1、设置分页参数
        PageHelper.startPage(dto.getPage(),dto.getPageSize());
        //2、调用mapper的列表查询方法，强转成Page
        Page<DishVO> page = dishMapper.page(dto);
        //3、封装PageResult对象并返回
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void delete(List<Long> ids) {
        //1、删除菜品之前，需要判断是否菜品是否起售，起售中不允许删除
        ids.forEach(id ->{
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });
        //2、需要判断菜品是否被套餐关联，关联了也不允许删除
        Integer count = setmealDishMapper.countByDishId(ids);
        if (count > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //3、删除菜品基本信息dish表
        dishMapper.deleteBatch(ids);
        //4、删除菜品口味列表信息 dish_flavor表
        dishFlavorMapper.deleteBatch(ids);
    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getById(Long id) {
        DishVO dishVO = new DishVO();
        //1、根据id查询菜品基本信息，封装到dishVO中
        Dish dish = dishMapper.selectById(id);
        BeanUtils.copyProperties(dish,dishVO);
        //2、根据id查询口味列表数据
        List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(id);
        dishVO.setFlavors(flavors);
        //3、构造DishVO对象并返回
        return dishVO;
    }

    /**
     * 修改菜品
     * @param dto
     */
    @Transactional
    @Override
    public void update(DishDTO dto) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto,dish);
        //1、修改菜品的基本信息，dish表
        dishMapper.update(dish);
        //2、修改口味列表信息，dish_flavor表
        //由于口味数据可能增加，可能删除，还可能修改口味的值，涉及到增删改操作，所以先全部删除旧数据，在添加新数据
        dishFlavorMapper.deleteByDishId(dto.getId());

        List<DishFlavor> flavors = dto.getFlavors();
        if (flavors != null && !flavors.isEmpty()){
            //关联菜品id
            flavors.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Setmeal> list(Integer categoryId) {
        return dishMapper.list(categoryId);
    }

    /**
     * 菜品起售禁售
     * @param status
     * @param id
     */
    @Override
    public void enableDisable(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .updateTime(LocalDateTime.now())
                .updateUser(BaseContext.getCurrentId())
                .build();
        dishMapper.update(dish);
    }

    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.listBy(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
